PowerGrip® GT® Belt Drives
PowerGrip® GT® Belt Drives
PowerGrip® GT® Belt Drives
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Useful Formulas and Calculations<br />
Power To or From<br />
Machinery<br />
In the absence of accurate data on horsepower<br />
requirements for a drive, it is sometimes possible to<br />
calculate the power output from a driveR machine or<br />
the required power input to a driveN machine. In<br />
each formula below, efficiency must be known or<br />
estimated. For checking a drive which is providing<br />
power to a pump or generator, it is more<br />
conservative to estimate a low efficiency for the<br />
driveN machine. For power input to a drive from a<br />
motor or turbine, is more conservative to estimate<br />
high efficiency for the driveR machine. Efficiency is<br />
used as a decimal in the formulas. For example, if a<br />
pump is 70% efficient, use .70 in the formula.<br />
Hydraulic Machinery<br />
Power required by pumps<br />
Kilowatts =<br />
A.C. Machinery<br />
(volts) (amps) (p.f.)<br />
Y<br />
Where: p.f. = Power factor<br />
Y = 1000 (Single phase)<br />
Y = 577 (Three phase)<br />
Power required for generator (alternator)<br />
Horsepower =<br />
(volts) (amps) (p.f.)<br />
(Z) (eff)<br />
Where: eff = Overall mechanical and hydraulic<br />
efficiency.<br />
p.f. = Power factor<br />
Z = 746 (Single phase)<br />
Z = 431 (Three phase)<br />
Kilowatts =<br />
(volts) (amps)<br />
1000<br />
Power required for generator<br />
Horsepower =<br />
(volts) (amps)<br />
(746)(eff)<br />
Where: eff = Overall mechanical and hydraulic<br />
efficiency.<br />
Power from motor<br />
D.C. Machinery<br />
Horsepower =<br />
(volts) (amps) (eff)<br />
746<br />
Where: eff = Overall mechanical and hydraulic<br />
efficiency.<br />
Horsepower =<br />
(F) (p)<br />
(1714) (eff)<br />
Power from motor<br />
Where: F = Flow rate, gallons per minute<br />
P = Discharge pressure for pumps, inlet<br />
pressure for turbines, pounds/square<br />
inch<br />
eff = Overall mechanical and hydraulic<br />
efficiency.<br />
Power from water wheel or turbine<br />
Horsepower =<br />
(volts) (amps) (p.f.) (EFF)<br />
(Z)<br />
Where: eff = Overall mechanical and hydraulic<br />
efficiency.<br />
p.f. = Power factor<br />
Z = 746 (Single phase)<br />
Z = 431 (Three phase)<br />
Horsepower =<br />
(F) (p) (eff)<br />
(1714)<br />
Where: F = Flow rate, gallons per minute<br />
P = Discharge pressure for pumps, inlet<br />
pressure for turbines, pounds/square<br />
inch<br />
eff = Overall mechanical and hydraulic<br />
efficiency.<br />
92 The World’s Most Trusted Name in <strong>Belt</strong>s, Hose & Hydraulics.
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